Bulletin of the Bureau of Fisheries . bymeans of two collecting vessels (#, figs. 5 and 18), one from each hemibranch. (Ina specimen 50 cm. long, these collecting vessels measured 1 to 3 cm. in length.) Sofar as known to the writer, the efferent branchial vessels of teleosts have beendescribed as single, one vessel on each holobranch and the two series of filamentarvessels opening into it. Parker (1886, p. <i89) states as follows regarding the efferentbranchial vessels: In Holocephali and Teleostei there is only one efferent artery toeach gill, corresponding to the anterior of the two effer
Bulletin of the Bureau of Fisheries . bymeans of two collecting vessels (#, figs. 5 and 18), one from each hemibranch. (Ina specimen 50 cm. long, these collecting vessels measured 1 to 3 cm. in length.) Sofar as known to the writer, the efferent branchial vessels of teleosts have beendescribed as single, one vessel on each holobranch and the two series of filamentarvessels opening into it. Parker (1886, p. <i89) states as follows regarding the efferentbranchial vessels: In Holocephali and Teleostei there is only one efferent artery toeach gill, corresponding to the anterior of the two efferent arteries in the plagiostomeholobranch. The writer finds, however, in a large number of teleosts in additionto the tile-fish, indications of two efferent branchial arteries on a single arch. Insome instances these vessels are double for almost the entire length of the arch, asin the case of the conger eel (Zeptocephalus, tig. 2), thus resembling in many respectsthe corresponding vessels in Ceratod-us, described by Spencer (1893).. Fig. 2.—Efferent branchial and heart arteries, with circulus cephalieus, in the conger eel (Leptocephalus conger). Ventral aspect,natural size. On the right sirte the efferent branchial vesselsare shown reflected so as to bring them into one plane. Theventral ends of the left efferent branchial arteries are drawn toshow their relation to those of the opposite side. 92 BULLETIN OK THE BUREAU OF FISHERIES. Tin afferent vessels (fig. 18, pi. i). The afferent branchial arteries, as a rule,run some distance on the gill arches before branching to the gill filaments. Ata point where the split ends of the efferent arteries join to form a single vessel, theafferent artery gives off a recurrent branch (1, fig. 18) which runs between the twoefferent vessels and branches to the most ventrally situated gill filaments. Beyondthis point the afferent vessel occupies a position lateral to the efferent trunk.
Size: 1357px × 1841px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
